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23 Posts in this encyclopedia categoryEarth fault detection
Immediately or within the framework of cyclical self-monitoring, the
unit assumes the agreed safe state after detection of the "earth fault"
error.
Electrical life
The electrical life of a control unit is defined by the number of
switching cycles under load reached or exceeded by 90% of all test
items, with no repair or replacement of any part.
Electro-sensitive protective equipment (ESPE)
Essentially a sensor function and the associated control / monitoring
function with output switching element (OSSD). [IEC / DIN EN 61496]
Electromechanical coupling relays
The electromechanical coupling relays imod and omod contain a high-quality card relay with the following features:better output-resistance characteristics than static coupling relaysswitches any DC and AC loadsswitches analogue values with less voltage loss than static coupling relays
Electronicshousing
The electronic enclosure product range consists of control cabinet
enclosures, distribution enclosures and a mounting rail bus system
(in-rail bus). Flexible electronics enclosures with widths from 6.2 to
200 mm enable fine-grained size adaptation to any application. The
continuous mounting rail bus (in-rail bus) ensures fast and reliable
data and power transmission. Instead of complex wiring, the module is
connected by simply snapping it onto the top-hat rail.
Emergency off
Emergency stop is switching off the corresponding energy supply with
electromechanical switching devices (stop category 0). If stop category 0
is not permissible for the machine, other measures such as protection
against direct contact may be necessary instead. If there is a
possibility of danger or damage as well as protection against direct
contact only by distance or obstacles in front of electrical energy,
emergency stop should be provided.
Emergency stop
For actuation in hazardous situations to cause the process or the
machine or system to be switched off. It must have positive-opening
contacts and should be easy to reach and safe to defeat [DIN EN 13850;
DIN EN 60204].
Emergency stop button
Emergency stop button for actuation in hazardous situations in order to
switch off the process or the machine or system. It must have
positive-opening contacts and should be easy to reach and safe to
override [EN 418].
Emergency stop circuits
In order to achieve a rapid stop of the hazardous movement in the
event of danger, the reliable functioning of the emergency stop device
is of particular importance. For this reason, the failure of operating
equipment downstream of an emergency stop command device or a properly
functioning protective device must be ruled out by appropriate
circuitry.be ruled out.
Emergency stop device
An emergency stop device is an arrangement of components designed to implement the emergency stop function.
Emergency stop module
Emergency stop modules safely and easily monitor safety functions
such as emergency stop or safety gate in almost any application and are
characterised by maximum safety for man and machine with the smallest
space requirement.
Enable current path
Generates a safety-related output signal. Enabling current paths act externally like normally open contacts (OSSD).
Equip
PCB relays can be assembled manually or automatically. The grid as
well as the hole diameters are to be carried out according to the
specifications in the data sheet. The relays must not be fixed on the
PCB by bending the solder terminals. This may change the relay
parameters or damage the sealing.If the relays are to be fixed by
means of an adhesive, it must be ensured that they are not damaged by
impermissibly high temperatures or the material used. The use of
silicone in the vicinity of the relays must be avoided at all costs.
Silicone can diffuse through the relay housings and cause contact
problems.In the case of automatic assembly, the permissible
acceleration values should be observed. Shock loads, e.g. from dropping,
should also be avoided. A hard impact from a height of 0.5 m can cause
accelerations of several 100 g, which can cause damage inside the relay
(e.g. cracks in plastic parts, reduction of contact forces, the armature
jumping out of its bearing). In case of doubt, these relays should not
be used any further.
Error tolerance time
Period of time during which the process can be impacted by faulty control signals without a dangerous condition occurring.
Evaluation unit, safety-related
Generates a safety-related output signal, depending on the status of
connected signal transmitters, either according to a fixed assignment or
according to programmed instructions. SAG.
Extension modules
With the extension modules from Dold, you can simply multiply the
output contacts of the basic modules in order to switch off any number
of control circuits in a safety-oriented manner. These are compact
switching devices with positively driven safety relays, which are
controlled by the respective function module (base module) and monitored
via a feedback circuit. By dividing them into several control circuits,
cost-effective contact reinforcement is also possible.